Belgian cytologist Pierre-Joseph van Beneden discovered that the gametes of the roundworm Ascaris contained two chromosomes while somatic cells contained four. B. Fertilization 1. van Beneden proposed in 1887 that an egg and sperm could fuse to form a zygote. 2. The fusion of gametes is called fertilization or syngamy. C. Meiosis 1. A reduction division is required to reduce the number of chromosomes to half so sexual reproduction can occur. 2. This reduction division is known as meiosis.
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CHAPTER 7 LIMITS AND CONTINUITY Focus on Exam 7 1 (a) |x + 3| = { -x - 3‚ x < -3‚ x + 3‚ x ≥ -3. (x + 1)(-x - 3) x+3 = -x - 1 (x + 1)(x + 3) For x ≥ -3‚ f (x) = x+3 =x+1 Hence‚ in the non-modulus form‚ -x - 1‚ x < -3‚ f (x) = x + 1‚ x ≥ -3. For x < -3‚ f (x) = { (b) The graph of f(x) is as shown below. y = −x − 3 y 2 y=x+1 1 −3 −2 −1 x O −1 −2 (c) lim f (x) = 2 x → -3- lim f (x) = -2 x → -3+ (d) lim f (x) does not exist
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fairly large molecules into cells b. Process of taking liquids or fairly large molecules out of the cell c. Process of putting liquids into cells d. Process of release of substance out of a cell by the fusion of a vesicle with the membrane 5. What is the key feature of active transport? a. It kills molecules b. Drives the molecules across the membrane from low to high c. Drives the molecules out the membrane d. Pushes cells out the membrane 6. What does the cell use active transport
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BIOLOGY 1201‚ Section #2 Spring‚ 2014 (MWF 9:30-10:20 AM) Instructor: Dr. Terry M. Bricker Office: A606 Life Science Annex (Laboratory‚ A623 – check the lab if I am not in the office!) Phone: 225-578-1555 E-mail: btbric@lsu.edu -- E-mail is an excellent way to contact me or ask questions. Office Hours: M‚Tu 3:30-4:30‚ or by appointment. - Please see me if you have questions or problems. COURSE: BIOL 1201‚ General Biology‚ 3 credit hours. Biology 1201 is a course intended for students that are majoring
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(1 point) ScoreSketch what you observe when examining the brine shrimp using the low-power lens and the high-power lens. If you saw different forms of the shrimp‚ try to determine which is more mature and describe the differences. Answer is below Answer SHAPE MERGEFORMAT Your Score___ of 10 Graded Assignment SCI203A Biology Unit 1 Lesson 5 Laboratory Using a Microscope 2006 K12 Inc. All rights reserved. Page PAGE 1 of NUMPAGES 6 Copying or distributing without K12s written consent
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there are three subatomic particles that form together to create an atom of an element; protons‚ neutrons‚ and electrons. Protons are positively charged and form the nucleus of an atom with neutrons that carry no charge. Electrons are negatively charged and are constantly moving around the nucleus. Ions are created when electrons move from one atom to another atom changing the charge of that atom to either positive or negative. When electrons move they form bonds. There are two types of bonds; ionic
Free Atom Chemical bond Hydrogen
Activities 5. Why do you think stop and start codon signals are necessary for protein synthesis? These are necessary because start codons tells the tRNA to begin translating the codons into proteins and stop codons tell the tRNA to stop translating codons into proteins. They are essential in the process of producing proteins. 6. Describe the processes of transcription and translation in your own words‚ based on what you have observed in the Gizmo. Transcription: Protein synthesis process starts
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CELLS All living things are made of cells‚ and cells are the smallest units that can be alive. Life on Earth is classified into five kingdoms‚ and they each have their own characteristic kind of cell. However the biggest division is between the cells of the prokaryote kingdom (the bacteria) and those of the other four kingdoms (animals‚ plants‚ fungi and protoctista)‚ which are all eukaryotic cells. Prokaryotic cells are smaller and simpler than eukaryotic cells‚ and do not have a nucleus. Prokaryote
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heterotrophic while viruses are autotrophic. (2 pts) Bacteria are living organisms; viruses are not. (0 pts) Bacteria have a membrane bound nucleus while viruses do not. (0 pts) Bacteria are multicellular; viruses are single cells. 0 /2 points 5. A single-celled organism is found living in a deep sea vent at the bottom of the ocean in extremely hot water. If it is examined further‚ which of the following is most
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Important Questions of this chapter: **Definition Cell cycle 2. Homologous Chromosome 3. Sister Chromatid 4. Synapsis **Short Questions 1.Describe the chief events of mitosis and show how these differ from meiosis. (V.V.I.) 2. What ‘checkpoints’ occur in cell cycle? What is the role of each? **Long Questions 1.Describe the phases of the cell cycle and the events that characterize each phase. Answer of short Definition is given below 1. Cell Cycle: The cell cycle is an orderly
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